/* 小屏幕（平板，大于等于 768px） */
@media (min-width: 768px) {
  .container {
    width: 750px;
  }

  section {
    padding: 120px 0;
  }

  .section-title-en {
    font-size: 16px;
  }

  .section-title {
    font-size: 40px;
    line-height: 48px;
  }

  .section-desc {
    font-size: 16px;
    line-height: 32px;
    margin-top: 24px;
  }

  .tuzi {
    display: block;
    width: 80px;
    height: 80px;
    position: absolute;
    z-index: -1;
  }

  .brand-section .brand-wrap {
    flex-direction: row;
    justify-content: center;
  }

  .brand-section .brand-lf {
    width: 240px;
    height: 240px;
  }

  .brand-section .tuzi {
    top: -64px;
    right: 32px;
  }

  .brand-section .brand-rt {
    margin-top: 0;
    margin-left: 64px;
    text-align: left;
  }

  .product-section .tuzi {
    display: block;
    top: -32px;
    left: -20px;
  }

  .product-section .product-wrap {
    align-items: flex-start;
  }

  .product-section .product-hd {
    position: relative;
    margin-left: calc(100vw / 9);
    padding-left: 32px;
  }

  .product-section .product-arrows {
    justify-content: flex-start;
    margin-left: calc(100vw / 9);
    padding-left: 32px;
  }

  .product-section .product-arrows a {
    width: 56px;
  }

  .lab-section .lab-wrap {
    flex-direction: row;
    align-items: center;
    width: 100%;
  }

  .lab-section .lab-hd {
    width: 50%;
    height: 400px;
  }

  .lab-section .lab-hd img {
    width: 100%;
    height: 100%;
    border-radius: 0;
    border-top-right-radius: 64px;
    border-bottom-right-radius: 64px;
  }

  .lab-section .lab-bd {
    flex: 1;
    text-align: left;
    padding-left: 32px;
    margin-top: 0;
  }

  .lab-section .tuzi {
    display: none;
  }

  .lab-section .tuzi2 {
    display: block;
  }

  footer {
    padding: 16px;
  }

  .footer {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer .icp {
    margin-top: 0;
  }

  .page-title {
    width: 200px;
    height: 200px;
  }

  .page-title > h1 {
    font-size: 20px;
  }

  .page-title > span {
    font-size: 18px;
    margin-top: 8px;
  }

  .news-box {
    grid-template-columns: 1fr 1fr;
    grid-gap: 40px;
    padding: 180px 0;
  }

  .news-box-hd {
    border-bottom: none;
  }

  .news-box-hd > img {
    height: 320px;
  }

  .news-item {
    width: 33.33%;
  }

  .news-item:nth-child(2n) {
    flex-direction: column;
  }

  .news-item:nth-child(3n + 2) {
    flex-direction: column-reverse;
  }
  .news-item:nth-child(2n) .news-content > img {
    transform: rotate(0deg);
  }
  .news-item:nth-child(3n + 2) .news-content > img {
    transform: rotate(180deg);
  }
  .news-item .news-content {
    height: 200px;
  }
  .news-item .news-content > p {
    font-size: 16px;
    line-height: 24px;
    height: 96px;
  }

  .news-container {
    padding: 160px 16px;
  }

  .news-title {
    font-size: 24px;
  }

  .news-date {
    font-size: 16px;
    margin-top: 24px;
  }

  .news-container .news-content {
    margin-top: 40px;
  }

  .intro-section,
  .research-section {
    padding: 160px 0;
  }

  .intro-wrapper #el-1 {
    display: block;
    width: 80px;
    position: absolute;
    top: 16%;
    left: 0;
  }

  .intro-wrapper #tuzi {
    display: block;
    width: 100px;
    position: absolute;
    top: 50%;
    right: 0;
  }

  .research-wrapper {
    flex-direction: row;
  }

  .research-box + .research-box {
    margin-top: 0;
    margin-left: 32px;
  }

  .research-box .research-img {
    height: 320px;
  }

  .research-box .section-title-en {
    align-self: flex-end;
  }

  .research-box .research-content {
    text-align: left;
    align-self: flex-start;
  }

  .research-box #el-2 {
    display: block;
    width: 160px;
    position: absolute;
    bottom: -24px;
    right: -24px;
    z-index: 1;
  }

  .contact-wrap {
    flex-direction: row;
    padding-top: 160px;
  }

  .contact-box + .contact-box {
    margin-top: 0;
    margin-left: 120px;
  }

  .contact-box > h2 {
    font-size: 20px;
  }

  .contact-app {
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-rows: unset;
    padding: 80px 0;
  }

  .contact-app > a > img {
    width: 140px;
    height: 140px;
  }

  .product-wrap {
    /* padding-top: 160px; */
  }

  .history-section {
    padding: 160px 0;
  }
  .history-box {
    grid-template-columns: 1fr 1fr 1fr;
    margin-top: 60px;
    grid-gap: 32px;
  }

  .history-item > p {
    font-size: 24px;
    margin-top: 48px;
  }
  .history-item > h2 {
    font-size: 18px;
    margin-top: 20px;
  }

  .concept-section {
    padding: 160px 0;
  }
  .concept-box {
    grid-template-columns: 1fr 1fr 1fr;
    margin-top: 60px;
  }
  .concept-item > h2 {
    font-size: 24px;
  }
  .concept-item > p {
    font-size: 18px;
    margin-top: 20px;
  }
  .concept-img {
    width: 480px;
    margin: 0 auto;
    margin-top: 60px;
  }
}

/* 中等屏幕（桌面显示器，大于等于 992px） */
@media (min-width: 992px) {
  .container {
    width: 970px;
  }

  header nav {
    position: relative;
    top: 0;
    opacity: 1;
    transform: scale(1);
    height: 100%;
    display: flex;
    flex-direction: revert;
    background-color: unset;
    justify-content: flex-end;
  }
  header nav a {
    color: var(--text-color-light);
    margin: 0 16px;
  }
  header nav a.active {
    color: var(--text-color-light);
  }
  header nav a.active::before,
  header nav a.active::after {
    background-color: var(--text-color-light);
  }
  header .burger {
    display: none;
  }

  section {
    padding: 160px 0;
  }

  .section-title-en {
    font-size: 17px;
  }

  .section-title {
    font-size: 44px;
    line-height: 56px;
    margin-top: 16px;
  }

  .section-desc {
    font-size: 18px;
    line-height: 40px;
    margin-top: 32px;
  }

  .tuzi {
    display: block;
    width: 100px;
    height: 100px;
    position: absolute;
    z-index: -1;
  }

  .brand-bg {
    left: -50%;
    transform: skewX(-20deg);
  }

  .brand-section .brand-lf {
    width: 320px;
    height: 320px;
  }

  .brand-section .brand-rt {
    margin-left: 160px;
  }

  .brand-section .tuzi {
    top: -72px;
    right: 40px;
  }

  .product-section .tuzi {
    top: -44px;
    left: -40px;
  }

  .product-section .product-hd {
    padding-left: 48px;
  }

  .product-section .product-bd {
    margin-top: 48px;
  }

  .product-section .product-arrows {
    margin-top: 48px;
    padding-left: 48px;
  }

  .product-section .product-arrows a {
    width: 64px;
  }

  .lab-section .lab-hd {
    height: 560px;
  }

  .lab-section .lab-bd {
    padding-left: 64px;
  }

  .page-title {
    width: 240px;
    height: 240px;
  }

  .page-title > h1 {
    font-size: 24px;
  }

  .page-title > span {
    font-size: 20px;
  }

  .news-box {
    grid-gap: 64px;
    padding: 200px 0;
  }

  .news-box-hd > img {
    height: 360px;
  }

  .news-item {
    width: 25%;
  }

  .news-item:nth-child(3n + 2) {
    flex-direction: column;
  }

  .news-item:nth-child(2n) {
    flex-direction: column-reverse;
  }

  .news-item:nth-child(3n + 2) .news-content > img {
    transform: rotate(0);
  }

  .news-item:nth-child(2n) .news-content > img {
    transform: rotate(180deg);
  }
  .news-item .news-content {
    height: 240px;
  }
  .news-item .news-content > p {
    font-size: 18px;
    line-height: 28px;
    height: 112px;
  }

  .news-container {
    padding: 200px 16px;
  }

  .news-title {
    font-size: 28px;
  }

  .news-date {
    margin-top: 28px;
  }

  .news-container .news-content {
    margin-top: 48px;
  }

  .intro-section,
  .research-section {
    padding: 180px 0;
  }

  .intro-wrapper #el-1 {
    width: 100px;
  }

  .intro-wrapper #tuzi {
    width: 120px;
  }

  .research-box + .research-box {
    margin-left: 48px;
  }

  .research-box .research-img {
    height: 400px;
  }

  .research-box #el-2 {
    width: 200px;
    bottom: -28px;
    right: -28px;
  }

  .contact-wrap {
    padding-top: 200px;
  }

  .contact-box + .contact-box {
    margin-left: 160px;
  }

  .contact-box > h2 {
    font-size: 24px;
  }

  .contact-box > p {
    font-size: 20px;
  }

  .contact-app {
    padding: 96px 0;
  }

  .contact-app > a > img {
    width: 160px;
    height: 160px;
  }

  .product-wrap {
    /* padding-top: 200px; */
  }

  .history-section {
    padding: 180px 0;
  }
  .history-box {
    grid-gap: 48px;
    margin-top: 80px;
  }

  .history-item > p {
    font-size: 26px;
    margin-top: 56px;
  }
  .history-item > h2 {
    font-size: 20px;
    margin-top: 24px;
  }

  .concept-section {
    padding: 180px 0;
  }
  .concept-box {
    grid-gap: 48px;
    margin-top: 80px;
  }
  .concept-item > h2 {
    font-size: 26px;
  }
  .concept-item > p {
    font-size: 20px;
    margin-top: 24px;
  }
  .concept-img {
    width: 560px;
    margin-top: 80px;
  }
}

/* 大屏幕（大桌面显示器，大于等于 1200px） */
@media (min-width: 1200px) {
  .container {
    width: 1170px;
  }

  section {
    padding: 200px 0;
  }

  .section-title-en {
    font-size: 18px;
  }

  .section-title {
    font-size: 48px;
    line-height: 64px;
    margin-top: 24px;
  }

  .section-desc {
    font-size: 20px;
    line-height: 48px;
    margin-top: 40px;
  }

  .tuzi {
    display: block;
    width: 120px;
    height: 120px;
    position: absolute;
    z-index: -1;
  }

  .brand-section .brand-lf {
    width: 400px;
    height: 400px;
  }

  .brand-section .tuzi {
    top: -88px;
    right: 56px;
  }

  .brand-section .brand-rt {
    margin-left: 200px;
  }

  .product-section .tuzi {
    top: -64px;
    left: -56px;
  }

  .product-section .product-hd {
    padding-left: 64px;
  }

  .product-section .product-bd {
    margin-top: 64px;
  }

  .product-section .product-arrows {
    margin-top: 64px;
    padding-left: 64px;
  }

  .product-section .product-arrows a {
    width: 72px;
  }

  .page-title {
    width: 280px;
    height: 280px;
  }

  .page-title > h1 {
    font-size: 28px;
  }

  .page-title > span {
    font-size: 24px;
  }

  .news-box {
    grid-gap: 80px;
    padding: 240px 0;
  }

  .news-box-hd > img {
    height: 400px;
  }

  .news-item {
    width: 20%;
  }

  .news-item:nth-child(3n + 2),
  .news-item:nth-child(2n) {
    flex-direction: column;
  }

  .news-item:nth-child(5n + 2),
  .news-item:nth-child(5n + 4) {
    flex-direction: column-reverse;
  }
  .news-item:nth-child(3n + 2) .news-content > img,
  .news-item:nth-child(2n) .news-content > img {
    transform: rotate(0);
  }

  .news-item:nth-child(5n + 2) .news-content > img,
  .news-item:nth-child(5n + 4) .news-content > img {
    transform: rotate(180deg);
  }
  .news-item .news-content {
    height: 280px;
  }
  .news-item .news-content > p {
    font-size: 20px;
    line-height: 32px;
    height: 128px;
  }

  .news-container {
    padding: 240px 16px;
  }

  .news-title {
    font-size: 32px;
  }

  .news-date {
    margin-top: 32px;
  }

  .news-container .news-content {
    margin-top: 56px;
  }

  .intro-section,
  .research-section {
    padding: 200px 0;
  }

  .intro-wrapper #el-1 {
    width: 120px;
  }

  .intro-wrapper #tuzi {
    width: 160px;
  }

  .research-box + .research-box {
    margin-left: 64px;
  }

  .research-box .research-img {
    height: 480px;
  }

  .research-box #el-2 {
    width: 240px;
    bottom: -32px;
    right: -32px;
  }

  .contact-wrap {
    padding-top: 240px;
  }

  .contact-box + .contact-box {
    margin-left: 200px;
  }

  .contact-box > h2 {
    font-size: 28px;
  }

  .contact-box > p {
    font-size: 22px;
  }

  .contact-app {
    padding: 120px 0;
  }

  .contact-app > a > img {
    width: 200px;
    height: 200px;
  }

  .product-wrap {
    /* padding-top: 240px; */
  }

  .history-section {
    padding: 200px 0;
  }
  .history-box {
    grid-gap: 64px;
    margin-top: 100px;
  }

  .history-item > p {
    font-size: 28px;
    margin-top: 64px;
  }
  .history-item > h2 {
    font-size: 22px;
    margin-top: 28px;
  }

  .concept-section {
    padding: 200px 0;
  }
  .concept-box {
    grid-gap: 64px;
    margin-top: 100px;
  }
  .concept-item > h2 {
    font-size: 28px;
  }
  .concept-item > p {
    font-size: 22px;
    margin-top: 28px;
  }
  .concept-img {
    width: 640px;
    margin-top: 100px;
  }
}
